1. Copyright, Valiant Communications Limited 2000-2005 VCL-SR-MUX V aliant C ommunications L imited Telecom Transmission Solutions Confidential Slide 1 G.703, 64Kbps Sub-Rate Multiplexer Updated : January, 2005 U.K. Valiant Communications (UK) Ltd 1, Acton Hill Mews, 310-328 Uxbridge Road, London W3 9QN, United Kingdom E-mail: gb@valiantcom.com Website: http://www.valiantcom.com INDIA Valiant Communications Limited 71/1, Shivaji Marg, New Delhi - 110015, India Phone: +91-11 4105 5601, 91-11 4105 5602 Fax: +91-11 4105 5604, 91-11 2543 4300 E-mail: getinfo@valiantcom.com Website: http://www.valiantcom.com U.S.A. Valcomm Technologies Inc. 4000 Ponce de Leon, Suite 470 Coral Gables, FL 33146 United States of America E-mail: us@valiantcom.com Website: http://www.valiantcom.com

2. Copyright, Valiant Communications Limited 2000-2005 Product Overview VCL-SR-MUX Confidential Slide 2 Valiant G.703, Sub-Rate Multiplexer multiplexes Six 9.6Kbps RS232 asynchronous data channels to a 64Kbps, G.703 co-directional, 4 wire synchronous data channel. The front panel has six, RS232 data ports into which upto six, RS232 asynchronous data channels @ 9.6Kbps each may be connected. The six RS232 asynchronous data channels @ 9.6Kbps are multiplexed into a 64Kbps, G.703 co-directional, 4 wire synchronous data channel, which is accessed from the system backpanel (rear). The equipment uses data buffering and phase-lock-loop techniques to ensure error free multiplexing and demultiplexing between the synchronous and asynchronous data ports. Front panel LED indicators indicate presence of Transmit and Receive data signal on each of the data ports. The equipment operates on a nominal -48VDC Input (-40VDC to 60VDC Input). The system also provides two dry-contact relay alarm outputs (normally open) on the backpanel (rear) which close to indicate the presence of a system alarm.

3. Copyright, Valiant Communications Limited 2000-2005 APPLICATIONS: Confidential Slide 4 Thin-Route Telephony satellite, radio and data networks Establishing Multiple Telemetry Links SCADA Networks To transport multiple compressed voice channels interface with VCL-TRLD to provide upto six voice channels on 64Kbps links. Interface to 64Kbps radios VCL-SR-MUX

4. Copyright, Valiant Communications Limited 2000-2005 Confidential Slide 5 Specifications of G.703 @ 64kbps, Synchronous Data Interface Port Number of Interfaces per System1 ConformityTo (CCITT) Rec. G.703 Type4 Wire, co-directional ModeSynchronous Bit Rate64Kbps Specifications of RS 232 @ 9.6Kbps, Asynchronous Data Interface Port Number of Interfaces per System6 TypeRS 232 Tx, Rx, Gnd ModeAsynchronous Baud Rate9.6 kbps - Fixed Data Size8bits ParityNone Flow Control None ( Xon / X off ) Stop Bit1 VCL-SR-MUX

5. Copyright, Valiant Communications Limited 2000-2005 VCL-SR-MUX

6. Confidential Slide 28 VCL Products E1, Voice & Data Drop-Insert Multiplexer PRI ISDN (Q.931) Multiplexers E1 Intelligent Channel Banks E1 / T1 DCME (Digital Circuit Multiplication Equipment) - Voice Compression Equipment Thin Route DCME E1 / T1 Echo Cancellers E1 / T1 Digital Cross Connect T1 / E1 Converters E3, 34Mbps Multiplexer 34Mbps Optical Line Transmission Equipment (OLTE) Digital Loop Carrier Remote Asset Management Systems

7. Copyright, Valiant Communications Limited 2000-2005 Thank you for your attention For more details visit us at our Website at http://www.valiantcom.com U.K. Valiant Communications (UK) Ltd 1, Acton Hill Mews, 310-328 Uxbridge Road, London W3 9QN, United Kingdom E-mail: gb@valiantcom.com Website: http://www.valiantcom.com INDIA Valiant Communications Limited 71/1, Shivaji Marg, New Delhi - 110015, India Phone: +91-11 4105 5601, 91-11 4105 5602 Fax: +91-11 4105 5604, 91-11 2543 4300 E-mail: getinfo@valiantcom.com Website: http://www.valiantcom.com U.S.A. Valcomm Technologies Inc. 4000 Ponce de Leon, Suite 470 Coral Gables, FL 33146 United States of America E-mail: us@valiantcom.com Website: http://www.valiantcom.com